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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34189f08a274d7fd8e66ad12ea2cd55c7a069f3289a30b24eedcf2ef6743ad6' 
  AND token = 'siv0ljCghfejPeLV4uA1fEx/3m4BdjqzkQf9jrexUEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}